Dither affects 'File Output' image even when "save as render" is disabled #99651

New Issue

Mario Tovirac · 2022-07-12T17:47:38+02:00

Mario Tovirac commented

2022-07-12 17:47:38 +02:00

Short description of error
The dither option in the Post Processing tab affects images saved through the file output node in the compositioner even when "save as render" is disabled, when disabled it should not touch the output image, when "save as render" is enabled it makes sense to dither.

noise in output file

Exact steps for others to reproduce the error

Open attached file
Optionally change the Dither in {nav Output Properties > Post Processing}
hit render
It will generate an image in the directory pointed to by the node File Output.
Note that Dither also affects this image.
Maybe the fileoutput node needs his own dither value, it really is bad when generating raw pixel data.

gradient.blend

**Short description of error** The dither option in the Post Processing tab affects images saved through the file output node in the compositioner even when "save as render" is disabled, when disabled it should not touch the output image, when "save as render" is enabled it makes sense to dither. ![image.png](https://archive.blender.org/developer/F13293201/image.png) noise in output file ![image.png](https://archive.blender.org/developer/F13293206/image.png) **Exact steps for others to reproduce the error** - Open attached file - Optionally change the Dither in {nav Output Properties > Post Processing} - hit render It will generate an image in the directory pointed to by the node `File Output`. Note that Dither also affects this image. Maybe the fileoutput node needs his own dither value, it really is bad when generating raw pixel data. [gradient.blend](https://archive.blender.org/developer/F13293203/gradient.blend)

Mario Tovirac commented

2022-07-12 17:47:38 +02:00

Added subscriber: @MarioTovirac

Pratik Borhade commented

2022-07-13 12:56:16 +02:00

Added subscriber: @PratikPB2123

Germano Cavalcante commented

2022-07-14 20:31:34 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-07-14 20:31:34 +02:00

Do you have any simple file showing this problem?

Due to the number of daily bug reports, it is preferable for the bug reporter to track down the issue and demonstrate it through a .blend file in order to optimize confirmation.

A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

Do you have any simple file showing this problem? Due to the number of daily bug reports, it is preferable for the bug reporter to track down the issue and demonstrate it through a .blend file in order to optimize confirmation. A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

Mario Tovirac commented

2022-07-14 23:51:51 +02:00

Just hit render and it will generate the texture, maybe the fileoutput node needs his own dither value, it really is bad when generating raw pixel data

noise in output file

gradient.blend

Just hit render and it will generate the texture, maybe the fileoutput node needs his own dither value, it really is bad when generating raw pixel data ![image.png](https://archive.blender.org/developer/F13293201/image.png) noise in output file ![image.png](https://archive.blender.org/developer/F13293206/image.png) [gradient.blend](https://archive.blender.org/developer/F13293203/gradient.blend)

Germano Cavalcante commented

2022-07-15 21:24:34 +02:00

I can confirm that the Dither option affects both the render result and the resulting image in the output of the File Output node.
It is indeed a confusing interface, but to fix it would need a design discussion and I'm not sure if it can be considered a bug.

However I encountered another problem. The file attached crashes in the last daily build. Needs investigation...

I can confirm that the Dither option affects both the render result and the resulting image in the output of the `File Output` node. It is indeed a confusing interface, but to fix it would need a design discussion and I'm not sure if it can be considered a bug. However I encountered another problem. The file attached crashes in the last daily build. Needs investigation...

Germano Cavalcante changed title from ~~Dither affects file output image even when "save as render" is disabled~~ to Dither affects 'File Output' image even when "save as render" is disabled

2022-07-15 23:39:06 +02:00

Germano Cavalcante commented

2022-07-15 23:39:15 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Evan Wilson commented

2022-07-20 06:16:05 +02:00

Added subscriber: @EAW

Evan Wilson commented

2022-07-20 06:16:05 +02:00

As currently defined in the Manual:

"Save As Render" refers to applying the View Transform, Look, Gamma, Exposure, and RGB Curves under the Color Management panel when saving an image.
https://docs.blender.org/manual/en/3.3/render/color_management.html#image-files

Dithering is a post process effect to break up banding when saving a low bit depth image.
https://docs.blender.org/manual/en/3.3/render/output/properties/post_processing.html#bpy-types-rendersettings-dither-intensity

I don't think that this could be considered a bug, but a feature request.

As currently defined in the Manual: "Save As Render" refers to applying the View Transform, Look, Gamma, Exposure, and RGB Curves under the Color Management panel when saving an image. https://docs.blender.org/manual/en/3.3/render/color_management.html#image-files Dithering is a post process effect to break up banding when saving a low bit depth image. https://docs.blender.org/manual/en/3.3/render/output/properties/post_processing.html#bpy-types-rendersettings-dither-intensity I don't think that this could be considered a bug, but a feature request.

Sergey Sharybin commented

2022-11-11 15:26:20 +01:00

Added subscriber: @Sergey

Sergey Sharybin commented

2022-11-11 15:26:20 +01:00

The option is indeed only affects color management. Dither is something more global throughout the render pipeline, and is not really considered a color management from the file IO perspective.

I can see how it is confusing, I do not think there is a quick solution to the UI which makes it clear without introducing other kinds of confusion. In a more ideal world it will be somehow better integrated with the selection of Scene Color management, or override, together with the file color management but this requires bigger design changes which is not really part of the bug tracking process,

The option is indeed only affects color management. Dither is something more global throughout the render pipeline, and is not really considered a color management from the file IO perspective. I can see how it is confusing, I do not think there is a quick solution to the UI which makes it clear without introducing other kinds of confusion. In a more ideal world it will be somehow better integrated with the selection of Scene Color management, or override, together with the file color management but this requires bigger design changes which is not really part of the bug tracking process,

Philipp Oeser removed the

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Dither affects 'File Output' image even when "save as render" is disabled #99651